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A survey of duadic codes is presented firstly, necessary and sufficient conditions for the existence of nontrivial duadic abelian codes over Z_4 are presented secondly.

文中首先综述duadic码；其次给出了Z4上存在非平凡duadic阿贝尔码的充分必要条件；最后给出了Z4上劈分为μ-1的非平凡duadic阿贝尔码存在的充分必要条件，这些条件也是存在Z4上非平凡自偶阿贝尔码的充分必要条件。

The integrated mathematic model of solidification is then established, which includes heat transfer, solute transfer, liquid flow and the movement of equiaxial crystals in solidification process.

本文通过两相流理论建立了等轴晶在对流金属液中移动的非稳态数学模型，推导了求解等轴晶在非稳态、非均匀液相流场中非稳态移动的数值表达式，并进一步推导了描述等轴晶在凝固过程中迁移、堆积规律的局部堆积方程式。

The DTA result shows that the Ni-Ce-B nano-amorphous alloy has four exothermal peaks located at 275, 330, 423 and 528℃, and the Ni-Ce-P nanoamorphous alloy has three exothermal peaks (278, 410 and 528℃). The temperature of the highest exothermal peak increases by 150 and 170℃ respectively, compared with Ni-B and Ni-P nano-amorphous alloys.

DTA结果表明，Ni-Ce-B纳米非晶态合金有275、330、423和528℃四个晶化峰，Ni-Ce-P纳米非晶态合金有3个晶化峰（其晶化峰分别在278、410和528℃），其最高晶化峰温度较相应Ni-B和Ni-P纳米非晶态合金的分别升高150℃，170℃。

Firstly, some difficult problems required to be solved,such as the land surface parameters′ calculation and observation over inhomogeneous land surface and development similarity theory which can be applicable to the inhomogeneous land surface. Secondly, studies of the bulk transfer coefficients over humid regions of China must be strengthened. Thirdly, whether or not understanding the landatmosphere interaction process over inhomogeneous and complicated land surface in its entirety, the land surface parameters′ expandedness form local to regional scope is a critical and difficult problem.

在此基础上，探讨了该领域研究中存在的几点科学问题：①需要解决非均匀下垫面地表参数的计算和观测以及发展适用于非均匀下垫面的相似性理论等难题；②对我国湿润地区地表总体输送系数的研究需要加强；③能否对非均匀复杂下垫面陆气相互作用过程进行全面的认识，地表参数由&点&到&面&的推广是关键也是难题。

A SPE procedure was suggested for extracting and concentrating fisetin by using different volume fractions of ethanol in aqueous solution as the loading conditions.

分别以中药黄栌的主要成分非瑟酮为印迹分子、丙烯酰胺为功能单体及乙二醇二甲基丙烯酸酯为交联剂，通过封管聚合法合成了分子印迹聚合物；将其装于自制的固相萃取柱中，研究了以不同体积比的乙醇-水溶液为溶剂时非瑟酮在柱上的保留行为；通过优化清洗及洗脱条件，使非瑟酮与它的结构相似物槲皮素在柱上得到了很好的分离。

No significant difference indrinking capacity was found between HS and FD and its non-early satiety subgroup.Ⅱ. Pathological findings in FD fundic mucosa and its relationship with WLT.(1) significant difference was found in 5-HT positive cell counting between early satietyand non-early satiety subgroups(P.05). but no difference in mast cell counting, activity,and H.

6HS组与FD组及FD的早饱和非早饱亚组在半排时间、排出量和排出率存在显著差异(P.05)，HS组的半排时间、排出量和排出率显著低于FD组及FD早饱和非早饱亚组：HS组与FD的早饱亚组之间的阈值饮水量和饱足饮水量存在显著差异(P.05)，HS组饮水量显著高于早饱组：HS组与FD组及HS组与FD的非早饱亚组之间的阈值饮水量和饱足饮水量均不存在显著差异。

The catalytic performance of all the amorphous alloy catalysts mentioned above was measured during liquid phase hydrogenation of furfural to furfuryl alcohol, together with the kinetic studies. The relationship between the catalyst performance and the structure of catalyst, surface electronic state of the amorphous alloy has been systematically studied based on a series of characterization of catalysts . Meanwhile, the promoting effects of the support on the thermal stability and catalytic activity of the amorphous alloy catalysts have been discussed.

本文采用一系列的表征方法(XRD、XPS、TEM、BET、氢吸附、TPD等)进一步研究非晶态合金催化剂的表面结构、表面电子态和催化性能之间的关系，探索电子效应和几何效应对催化剂活性中心结构的影响，探索非晶态合金的晶化失活和载体对非晶态结构的稳定化作用，以及修饰剂对催化性能的改善作用等。

The crystallization temperature of amorphous Gein Ge-Aurnonolayer films can be reduced by increasing the content of Au.The as-deposited Ge-5at%Au monolayer films are amorphous and can becrystallized at 150℃.

Ge-Au合金单层膜中Au含量的增加，可以使非晶Ge的晶化温度(纯非晶Ge晶化温度为400℃)降低，如Ge-5at％Au单层膜原态为非晶态，晶化温度为150℃。

On the basis of satellite remote sensing image,GIS was applied to analyze 3-demension information about the geomorphy to investigate the non-point source pollution distribution in association with soil erosion information, and thus to pinpoint the essential pollution control region.

我国东部湖泊的污染负荷输人量中，农业非点源污染负荷人湖量已超过50%，大理洱海流域非点源污染氮、磷分别占流域污染负荷的97.1%和92.5写，农田过量施用化肥是造成非点源污染的主要原因图。

The results of numerical analysis show that the elastic modular and the poisson ratio have no effect on two-dimensional bearing capacity, but can affect the ultimate bearing capacity of three-dimensional foundations and control the convergence and precision of finite element calculation; the earth pressure coefficient controls the geostatic stress of foundation, sequentially affects the ultimate bearing capacity of foundations and the convergence of numerical calculation. When calculating the ultimate bearing capacity of undrained saturated foundation, the complete formulation exists shear locking, and reduce formulation exists hourglassing, so the hybrid formulation is suitable to imitate the geomaterial. When the soil obeys nonrelevent flow rule, the yielding function is different from potential function, and the elastic-plastic matrix of soil is asymmetric, so the unsymmetry numerical solver and appropriate finite element mesh is required.

研究结果表明，土体弹性模量和泊松比对二维基础极限承载力没有影响，但是影响着三维矩形基础的极限承载力，控制着ABAQUS数值算法的计算精度与收敛速度；地基土压力系数控制着地基土体中的地应力平衡，从而影响着二维条形基础和三维矩形基础的极限承载力和地基破坏包络面；对于不排水饱和软黏土地基，常规的完全积分单元会造成剪力自锁现象，而减缩积分单元则存在过于柔化的现象，故采用杂交单元来模拟较合适；当土体服从非关联流动法则时，屈服函数与塑性势函数之间存在差异，从而导致土体弹塑性矩阵呈现非对称性，在有限元计算中必须采用非对称数值解法，并且合理地划分单元才能对极限承载力进行准确求解。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。